[英]Getting Null value from JSP to Servlet in second Declaration
I have a problem in declaration of int dept_id = Integer.parseInt(request.getParameter("dept_id"));
我在声明
int dept_id = Integer.parseInt(request.getParameter("dept_id"));
It always get java.lang.NumberFormatException: null. 它总是获取java.lang.NumberFormatException:null。 but the first declaration of int emp_id it is working but for dept_id it always get null value.
但是int emp_id的第一个声明可以正常工作,但对于dept_id则始终为null值。
Here is my Servlet 这是我的Servlet
public UserController() {
super();
udao = new UserDao();
ddao = new DepartmentDao();
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String forward="";
String action = request.getParameter("action");
forward = INSERT_OR_EDIT;
int emp_id = Integer.parseInt(request.getParameter("emp_id"));
int dept_id = Integer.parseInt(request.getParameter("dept_id"));
User user = udao.GetUser(emp_id);
User user2 = ddao.GetHub(dept_id);
request.setAttribute("user", user);
request.setAttribute("user2", user2);
RequestDispatcher view = request.getRequestDispatcher(forward);
view.forward(request, response);
}
JSP JSP
<fieldset>
<legend id="myLegend">User</legend>
<!-- <label for="emp_id">
Employee ID :
</label> -->
<input type="text" readonly="readonly" name="emp_id" style="display:none"
value="<c:out value="${user.emp_id}" />" />
<label for="serial_number">Serial Number :</label>
<input type="text" name="serial_number" placeholder="
value="<c:out value="${user.serial_number}" />" /><br /><br />
<!-- <label for="dept_id">
Department ID :
</label> -->
<input type="text" readonly="readonly" name="emp_id" style="display:none"
value="<c:out value="${user2.dept_id}" />" />
<label>Hub :</label>
<input type="text" name="department_name"
value="<c:out value="${user2.dept_name}" />" /><br /><br />
</fieldset>
The name for your dept_id is emp_id. 您的dept_id的名称是emp_id。 It should look like:
它应该看起来像:
<input type="text" readonly="readonly" name="dept_id" style="display:none"
value="<c:out value="${user2.dept_id}" />" />
I think you just overlooked this! 我认为您只是忽略了这一点!
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